you have several 'power' sources in your RV:
12v battery power, for general lights, fans, water pump, etc.
Shore Power(thru your main electrical panel breaker box), when you are plugged into 120v power, for microwave, air conditioners, etc.
Your GENERATOR also does the same thing.
and even your Engine, via the alternator, while provide 'pass thru' power to your battery charger and 12v items in the RV
so, when you enter the coach and hit the 'switch', and I'm assuming you mean the 12v disconnect 'Use/Store' switch(sometimes referred as the 'salesman's' switch), you are allowing your 12v battery bank to power the 12v items, such as lights and fans.
if these items are not working, or for long, then your batteries are too low.
When you crank and run your vehicle, the engine's alternator will soon start to provide 12v charging to the batteries, thereby giving you back your 12v power to lights and fans.
At the same time, it is charging the battery bank, though it will take a very long time to charge them back to 'fully charged' status, where they will work the 12v items on their own, as they should.
When you use the generator, or shore power, it is providing battery charging to your battery bank via either your Converter, or your Inverter/Charger... but both do the same - charge the batteries, at the same time it gives you all your 12v items, AND gives you power to your large draw items, like air conditioning and TVs and microwave, etc.
Let the generator run for an hour and then see how your battery bank holds up - it will take some time to get them 'back' to fully charged.
Remember, too, that while you have engine or generator or shore power, your battery charger will be charging the battery bank, and it may initially 'show' that they are full charged, but it's really a false reading - at least 'while' it is charging. The best time to really check to actual status of your batteries is while they are NOT charging, and while very little, if anything, is being powered. If you see 12.8, then you are good to go. If you see much less, such as 11.5 to 12.5, then you are not yet seeing full charged batteries. You may not have a 'numbered' readout of your status, but if you are seeing '4' lights, then you are basically fully charged.
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The Turners...
'07 Rockwood Signature Ultralight...
two Campers and two Electric cars : )
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